hi im going to make a box for my subs soon. i got box plans over the internet and am wondering if they are good. i have 2 15 comp vr. the box is about 6.5^3 and tuned to 32hz. is 32hz a good freq to toon to. i listen to nothing but rap(three six mafia) when i use my subs.it will be in a 04 grand cherokee daily driver setup. is this good or should i tune higher?